package collection;

import java.util.ArrayList;
import java.util.Collection;

/**Collection接口的演示*/
public class CollectionDemo {
    public static void main(String[] args) {
        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);

        /*
        * boolean contains(Object o):
         判断当前集合是否包含给定元素o
         * 判断依据是给定元素是否与当前集合存在equals（）比较为true的情况
         */
        Point p=new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println("是否包含:"+contains);//true

        //boolean remove(Object o):一般都不接收boolean的结果
        //从当前集合中删除与给定元素o的equals（）比较为true的元素
        //若存在重复元素则只删除一次

        c.remove(p);
        System.out.println(c);

        //集合中存放的是元素的引用
        Collection cc=new ArrayList();
        Point pp=new Point(1,2);
        cc.add(pp);
        System.out.println("pp:+pp");
        System.out.println("cc:+cc");

        pp.setX(100);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);

        c.clear();
        System.out.println(c);










       /* Collection c=new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        //集合重写了Object的toString（）方法
        System.out.println(c);
        System.out.println("size:"+c.size());
        //isEmpty()判断集合是否为空集(size()为0表示空集)
        System.out.println("是否为空集"+c.isEmpty());
        c.clear();//清空集合
        System.out.println("集合已清空");
        System.out.println(c);//[]
        System.out.println("size："+c.size());//0
        System.out.println("是否为空集："+c.isEmpty());


        */

    }
}
